看看PHP 多进程处理任务_PHP

概述看看PHP 多进程处理任务

pcntl 模块（非 Unix 类系统不支持此模块）

一个 PHP 多进程简单例子大概是这个样子：

// 5 个子进程处理任务for ($i = 0; $i < 5; $i++) {    $pID = pcntl_fork();    if ($pID == -1) {        dIE("Could not fork");    } elseif ($pID) {        echo "I'm the Parent $i\n";    } else { // 子进程处理        echo "I'm the Child $i\n";        // 业务处理        exit($i); // 一定要注意退出子进程，否则 pcntl_fork() 会被子进程再 fork，带来处理上的影响。    }}// 等待子进程执行结束while (pcntl_waitpID(0, $status) != -1) {    $status = pcntl_wexitstatus($status);    echo "Child $status completed\n";}复制代码

当然实际应用中我们不能够这样输出代码，不够健壮，也不够优雅，我所以找了个基于 pcntl 封装的扩展包来使用。

spatIE/async - 基于 pcntl 封装的扩展包

以下是我使用 spatIE/async 来优化一个多进程请求的例子

原代码（耗时 20s 左右）- github.com/guanguans/m…

/** * @param string $keyword * * @return array */public function searchAll(string $keyword): array{    $songall = [];    foreach ($this->platforms as $platform) {        $songall = array_merge($songall, $this->search($platform, $keyword));    }    return $songall;}/** * @param string $platform * @param string $keyword * * @return mixed */public function search(string $platform, string $keyword){    $meting = $this->getMeting($platform);    $songs = Json_decode($meting->format()->search($keyword), true);    foreach ($songs as $key => &$song) {        $detail = Json_decode($meting->format()->url($song['url_ID']), true);        if (empty($detail['url'])) {            unset($songs[$key]);        }        $song = array_merge($song, $detail);    }    unset($song);    return $songs;}复制代码

改进后（耗时 4s 左右）- github.com/guanguans/m…

/** * @param string $keyword * * @return array */public function searchAll(string $keyword): array{    $songall = [];    $pool = Pool::create();    foreach ($this->platforms as $platform) {        $pool->add(function () use ($platform, $keyword) {            return $this->search($platform, $keyword);        }, $this->getSerializedOutput())->then(function ($output) use (&$songall) {            $songall = array_merge($songall, $output);        })->catch(function (\Throwable $exception) {            exit($exception->getMessage());        });    }    $pool->wait();    return $songall;}/** * @return mixed */public function search(string $platform, string $keyword){    $meting = $this->getMeting($platform);    $songs = Json_decode($meting->format()->search($keyword), true);    $pool = Pool::create();    foreach ($songs as $key => &$song) {        $pool->add(function () use ($meting, $song) {            return Json_decode($meting->format()->url($song['url_ID']), true);        })->then(function ($output) use (&$songs, &$song, $key) {            $song = array_merge($song, $output);            if (empty($song['url'])) {                unset($songs[$key]);            }        })->catch(function (\Throwable $exception) {            exit($exception->getMessage());        });    }    unset($song);    $pool->wait();    return $songs;}复制代码